# To build a social graph > This protocol supports all graph databases conforming to the RDF specification. We can have a simple social graph by importing the RDF data constructed from the last chapter.

## To use Neptune > [Amazon Neptune](https://docs.aws.amazon.com/zh_cn/neptune/latest/userguide/intro.html) is a fast and scalable graph database service. It can efficiently store and navigate highly interconnected data. Its query processing engine is optimized for leading graph query languages such as Apache TinkerPop™ Gremlin and W3C's RDF SPARQL. Neptune provides high performance via these open graph frameworks and standard APIs. With [Amazon Neptune](https://docs.aws.amazon.com/zh_cn/neptune/latest/userguide/intro.html) we can build a social graph using users' behavioral data on the blockchain. Steps: 1. Launch a Neptune instance via the [aws console](https://ap-northeast-1.console.aws.amazon.com/neptune/home). 2. Composite the sparql constructed from the last chapter into an "insert" command in Neptune: ```sparql update=PREFIX : PREFIX p: PREFIX rdf: PREFIX xsd: PREFIX rdfs: INSERT DATA {GRAPH { :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe a :Soul; p:name "Alice" . :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e a :Soul; p:name "Bob" . :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe p:following :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e . }} ``` 3. Call the Neptune service interface to save RDF: ```shell curl -X POST --data-binary 'update=PREFIX : PREFIX p: PREFIX rdf: PREFIX xsd: PREFIX rdfs: INSERT DATA {GRAPH { :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe a :Soul; p:name "Alice" . :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e a :Soul; p:name "Bob" . :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe p:following :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e . }}' https://your-neptune-endpoint:port/sparql ``` By now we have indexed the data `Alice follow Bob` into the graph database. We can query the data via the Neptune service interface: ```shell curl -X POST --data-binary 'query=select * where { ?s a :Soul; p:name "Alice". ?s p:following ?f .} limit 10' https://your-neptune-endpoint:port/sparql ``` ## To use Jena For demonstration purposes, we will use [docker](https://www.docker.com/) to launch a Jena service: ```shell docker run -p 3030:3030 -e ADMIN_PASSWORD=pw123 stain/jena-fuseki ``` If successful, please visit using the account "admin" and password "pw123". 1. First please create a dataset:

2. Then import the data from the last step into the graph database. ```sparql PREFIX : PREFIX p: PREFIX rdf: PREFIX xsd: PREFIX rdfs: :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe a :Soul; p:name "Alice" . :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e a :Soul; p:name "Bob" . :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe p:following :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e . ```

3. Finally, switch to the Query tag to query which people Alice has followed: ```sparql PREFIX : PREFIX p: SELECT * WHERE { ?me a :Soul; p:name "Alice"; p:following ?following . ?following p:name ?name . } LIMIT 10 ```

The query result is : Alice's address `0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe` followed Bob's address `0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e`. ## To use Neo4j For demonstration purposes, we will use [docker](https://www.docker.com/) to launch a Neo4j service: ```shell docker run \ -p 7474:7474 -p 7687:7687 \ --name neo4j-neosemantics \ neo4j:5.5.0 ``` 1. Install plugins to support RDF ```shell docker exec -it neo4j-neosemantics bash cd plugins/ wget https://github.com/neo4j-labs/neosemantics/releases/download/5.5.0.0/neosemantics-5.5.0.0.jar ``` 2. Configure Plugin Open file: `conf/neo4j.conf` and append `dbms.unmanaged_extension_classes=n10s.endpoint=/rdf`. then restart Neo4j Service: ```shell docker restart neo4j-neosemantics ``` Open Neo4j Browser: Default login is username 'neo4j' and password 'neo4j'. 3. Configure Graph Execute the following commands in the Neo4j browser input box: {% tabs %} {% tab title="cypher-shell" %} ```cypher CALL n10s.graphconfig.init(); CREATE CONSTRAINT n10s_unique_uri FOR (r:Resource) REQUIRE r.uri IS UNIQUE; CALL n10s.graphconfig.init( { handleMultival: "ARRAY" }) CALL n10s.nsprefixes.add("e", "http://relationlabs.ai/entity/"); CALL n10s.nsprefixes.add("p", "http://relationlabs.ai/property/"); ``` {% endtab %} {% endtabs %} 4. Importing RDF Data Execute the following commands in the Neo4j browser input box: {% tabs %} {% tab title="cypher-shell" %} ```cypher CALL n10s.rdf.import.inline("PREFIX : PREFIX p: prefix rdf: prefix xsd: prefix rdfs: :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe a :Soul; p:name \"Alice\" . :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e a :Soul; p:name \"Bob\" . :Soul_0x0109c8ee3151bde7b6b5d9f37e9d2c4bc16930fe p:following :Soul_0x6247123ec0fe0d25feb811e3c4d4a760c1f2e63e .","Turtle"); ``` {% endtab %} {% endtabs %} 5. Querying Execute the following commands in the Neo4j browser input box: {% tabs %} {% tab title="cypher-shell" %} ```cypher MATCH (ss:Resource {p__name: ["Alice"]})-[:p__following]->(oo) RETURN ss, oo ``` {% endtab %} {% endtabs %}